出现键盘时无法上移自定义 UIView

Posted 2023-03-13

【中文标题】出现键盘时无法上移自定义 UIView

【英文标题】：Cannot move up custom UIView when keyboard appears

【发布时间】：2020-05-19 21:41:21

【问题描述】：

我在移动自定义 UIView（基本上是一个警报）时遇到了一些问题。 当我打开键盘时，一切正常，并且警报按原样向上移动。 但是，只要我在 textField 中输入某些内容，警报就会回到原来的位置。 我不知道为什么会这样。顺便说一句，警报视图被添加到情节提要中并被限制在中心。 我附上了一些解释性的图片 提前致谢。

class AlertViewController: UIViewController 
       @IBOutlet var AlertView: UIView! //Alert View storyboard outlet

       override func viewDidLoad()  
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: 
        UIResponder.keyboardWillShowNotification, object: nil)
 

@objc func keyboardWillShow(notification: NSNotification)

        guard let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue else 
           // if keyboard size is not available for some reason, don't do anything
           return
        

        let keyBoardTop = self.view.frame.height - keyboardSize.height
        let bottomOfAlertView = AlertView.convert(AlertView.bounds, to: self.view).maxY;

        print("keyBoardTop: \(keyBoardTop)")
        print("BottomOfAlertView: \(bottomOfAlertView)")
        print(AlertView.frame.origin.y)

        AlertView.frame.origin.y = AlertView.frame.origin.y - (bottomOfAlertView - keyBoardTop)

    

Img Correct

Img Alert after typing

【参考方案1】：

尝试像这样更改警报的底部约束怎么样

@objc func handleShowKeyboard(_ notification: Notification) 
    if let keyboardFrame: NSValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue 
        let keyboardRectangle = keyboardFrame.cgRectValue
        let keyboardOffset = keyboardRectangle.height
        if AlertView.viewBottomAnchor.constant == 0 
            AlertView.viewBottomAnchor.constant -= (keyboardOffset - self.view.safeAreaInsets.bottom)
            AlertView.layoutIfNeeded()